United States Patent 7,706,482
Li , et al. April 27, 2010
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Algorithm for multiple-symbol differential detection
Abstract
A method for differential phase evaluation of M-ary communication data is employed in which the data consists of N sequential symbols r.sub.1 . . . r.sub.N, each having one of M transmitted phases. Selected sequences of N-1 elements that represent possible sequences of phase differentials are evaluated using multiple-symbol differential detection. Using r.sub.1 as the reference for each phase differential estimate, s.sup.N-1 phase differential sequences are selected in the form (P.sub.2i, P.sub.3i, . . . , P.sub.Ni) for i=1 to s for evaluating said symbol set, where s is predetermined and 1<s<M. Each set of s phase differential estimate values are chosen based on being the closest in value to the actual transmitted phase differential value. These s phase differential estimates can be determined mathematically as those which produce the maximum results using conventional differential detection.
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Inventors: Li; Bin (Ronkonkoma, NY), DiFazio; Robert A. (Greenlawn, NY), Grieco; Donald M. (Manhassett, NY), Zeira; Ariela (Huntington, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 12/288,630
Filed: October 21, 2008
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
11015220 Dec., 2004 7440519
10279238 Oct., 2002 6842496
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Current U.S. Class: 375/341
Current International Class: H04L 27/06 (20060101)
Field of Search: 375/341,329,130,262,146 714/794,795
